Cover image in opus file is not shown in KDE media control in system tray

[shmerl]

When playing an opus file which contains a cover image with mpv, it's not propagating through mpris.

I think it's a problem with mpv-mpris, since mpv shows the image in the window itself and reports using a cover art when run from the terminal. And when playing it with vlc, it shows up there fine.

If you think it's an issue with mpv itself, I can open a bug there too.

[shmerl]

Here is a file you can test it on (run it in a loop, it's pretty short):

test.zip

[hoyon]

Yes this is a known limitation of mpv-mpris. Only external album art is currently supported and the test file you provided uses an embedded image.

Although now that I think about it, it might be possible to use mpv's screenshot command to make this work. I'll have a play around with that when I have some time. PRs also welcome.

[shmerl]

Is it a limitation of mpris protocol itself (i.e. it's impossible a normal way without such hacks like making a temporary external file), or mpv-mpris is just not implementing some features yet? How does it work for VLC for example?

I'd be interested in looking into it, if there is some correct solution.

[shmerl]

mpv itself somehow recognizes that embedded image is a cover art and displays it. May be mpv-mpris can query that data from mpv itself? I'm looking through the code to try to understand what the plugin is doing now.

[shmerl]

OK, I see it's doing try_put_local_art(mpv, dict, path); now. I'll look into mpv itself, may be its library has some kind of function for getting the cover art or if not, I can open a feature request there. There is no need to duplicate that code.

[shmerl]

Looking also into how VLC handled embedded cover image:

https://github.com/videolan/vlc/blob/master/modules/meta_engine/taglib.cpp#L780
https://github.com/videolan/vlc/blob/master/modules/meta_engine/taglib.cpp#L830

[shmerl]

I'm not sure I understand it fully, but I think VLC reads base 64 encoded metadata, decodes into binary, and somehow handles that later. I.e. might be not even writing any file, just using the data from memory.